Bleaching of kraft pulp from Leucaena leucocephala grown in Tanzania
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Abstract
Kraft pulp from Leucaena leucocephala with a kappa number of 28 was oxygen delignified and then bleached using two sequences, one employing chlorine and the other chlorine dioxide (clo2), followed by oxidative extraction with hydrogen peroxide.
The pulp could be readily bleached to a brightness level of 80% ISO using both sequences. When compared to Eucalyptus, bleachability was achieved more readily for the eucalyptus pulp. With the current environmental concern for pollution, a bleaching sequence utilizing chlorine dioxide is recommended instead of a sequence employing chlorine as it will significantly reduce effluent load in the waste treatment plant.
Keywords
Bleach Eucalyptus Kraft Pulp Kappa Number Chlorine DioxideBleichen von Sulfatzellstoff von Leucaena leucocephala aus Tansania
Zusammenfassung
Sulfatzellstoff aus Leucaena leucocephala mit Kappazahl von 28 wurde einer Sauerstoffbleiche unterzogen (SO2−O−C−EOP), wobei eine Sequenz eine Chlorstufe, die andere eine Chlordioxidstufe enthielt. Der Zellstoff konnte leicht zu einem Weißgrad von 80% ISO gebleicht werden. Die Bleiche verläuft einfacher als bei Eukalyptuszellstoffen. Aus Gründen des Umweltschutzes wird die Chlordioxidzwischenstufe gegenüber Chlor bevorzugt.
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References
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